Now you can build right angle drives inside or outside of channel with these new 24 tooth, 32 pitch bevel gears. We offer them in four bore sizes, 1/4”, 4mm, 5mm and 6mm. Great for building differentials or any application where you need to transfer rotational motion 90 degrees. Sold individually with set-screw.
http://www.servocity.com/html/32_pitch__24_tooth_bevel_gears.html#.U4eLAvmwLq8
https://www.youtube.com/watch?v=vP85dB82C-Y